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median trigonometry proportion tiling money dodecagons taxicab geometry sum to infinity lists cubics tournaments dice prime numbers christmas mean shape perimeter indices chocolate tangents the only crossnumber algebra spheres symmetry coins cryptic clues balancing volume matrices square numbers fractions division angles area shapes sport digits addition chess star numbers hexagons cryptic crossnumbers quadratics medians rugby gerrymandering sums menace parabolas square grids multiplication folding tube maps geometric mean combinatorics probability grids multiplaction squares axes differentiation 2d shapes planes factorials calculus clocks people maths 3d shapes geometry even numbers factors lines quadrilaterals speed unit fractions dates crosswords time surds doubling integers squares scales colouring coordinates digital products powers albgebra chalkdust crossnumber polygons pentagons palindromes irreducible numbers crossnumbers bases circles digital clocks dominos elections partitions xor odd numbers triangles ave expansions remainders square roots logic consecutive integers numbers range products ellipses complex numbers cube numbers percentages consecutive numbers means functions arrows advent regular shapes graphs decahedra routes games integration number polynomials averages neighbours probabilty perfect numbers geometric means binary pascal's triangle floors cards rectangles triangle numbers sequences determinants wordplay books prime factors multiples sets